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I've used Plexus, but prefer the Honda Spray Cleaner/Polish (I think it's marketed under a different brand name now)...it seems to buff off a little easier than the Plexus.
Both of our HD dealers carry it. I have even found it where I bought my Hot Tub- they recommend it for the plastic. It is really good stuff. I have ridden through bugs after using this stuff and they come off with little effort.